Original oil and gas vintage magazine ad for SECURITY ENGINEERING. Dresser Operations depend on 3-cutter rock bits. Rugged construction, improved types, with jet or regular circulation. Type S3, S6, M4, H-7 and H7W for hard, medium or soft formations. This 1953 unique old one page petroleum drilling equipment trade advertisement would display beautifully matted and framed.
- SKU zd763
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